Geodesic
On Quasi-Periodic Parametric Perturbations of Hamiltonian Systems
Russian journal of nonlinear dynamics, Tome 16 (2020) no. 2, pp. 369-378.

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We study nonconservative quasi-periodic $m$-frequency $\it parametric$ perturbations of twodimensional nonlinear Hamiltonian systems. Our objective is to specify the conditions for the existence of new regimes in resonance zones, which may arise due to parametric terms in the perturbation. These regimes correspond to $(m+1)$-frequency quasi-periodic solutions, which are not generated from Kolmogorov tori of the unperturbed system. The conditions for the existence of these solutions are found. The study is based on averaging theory and the analysis of the corresponding averaged systems. We illustrate the results with an example of a Duffing type equation.
Keywords: resonances, quasi-periodic, parametric, averaging method, phase curves, equilibrium states.
Mots-clés : limit cycles, invariant torus 
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A. D. Morozov; K. E. Morozov. On Quasi-Periodic Parametric Perturbations of Hamiltonian Systems. Russian journal of nonlinear dynamics, Tome 16 (2020) no. 2, pp. 369-378. http://geodesic.mathdoc.fr/item/ND_2020_16_2_a9/

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